Editing Biogeochemical Cycles (section)

== <span style="color: #FFFFFF;">Applying</span> ==
'''Modeling 'Eutrophication' (Nutrient Overload):'''
<syntaxhighlight lang="python">
def simulate_lake_health(nitrogen_input_kg):
    """
    Shows how extra nutrients lead to a 'Dead Zone'.
    """
    safe_limit = 50
    if nitrogen_input_kg < safe_limit:
        return "HEALTHY: Balanced ecosystem."
    
    # Algae bloom happens
    oxygen_level = 100 - (nitrogen_input_kg - safe_limit) * 2
    
    if oxygen_level < 20:
        return f"DEAD ZONE: Oxygen at {oxygen_level}%. Fish cannot survive."
    else:
        return f"ALGAE BLOOM: Oxygen dropping ({oxygen_level}%)."

# Scenario: Heavy farm runoff after a storm
print(simulate_lake_health(90))
# This is why 'Precision Farming' is essential to reduce 
# runoff and save our waterways.
</syntaxhighlight>

; Cycle Phenomena
: '''The Greenhouse Effect''' → A direct result of the Carbon Cycle being out of balance.
: '''Legumes (Beans/Peas)''' → Plants that have a "partnership" with nitrogen-fixing bacteria, naturally enriching the soil.
: '''Acid Rain''' → Caused by Sulfur and Nitrogen cycles being disrupted by industrial pollution.
: '''Great Oxidation Event''' → A period 2.4 billion years ago when cyanobacteria "broke" the carbon/oxygen cycle, creating our oxygen-rich atmosphere.
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